/* eslint-disable */
let idTmr;
const getExplorer = () => {
  let explorer = window.navigator.userAgent;
  //ie
  if (explorer.indexOf("MSIE") >= 0) {
    return 'ie';
  }
  //firefox

  else if (explorer.indexOf("Firefox") >= 0) {
    return 'Firefox';
  }
  //Chrome
  else if (explorer.indexOf("Chrome") >= 0) {
    return 'Chrome';
  }
  //Opera
  else if (explorer.indexOf("Opera") >= 0) {
    return 'Opera';
  }
  //Safari
  else if (explorer.indexOf("Safari") >= 0) {
    return 'Safari';
  }
}
// 判断浏览器是否为IE
const exportToExcel = (data, name) => {
  // 判断是否为IE
  if (getExplorer() == 'ie') {
    tableToIE(data, name)
  } else {
    tableToNotIE(data, name)
  }
}


const Cleanup = () => {
  window.clearInterval(idTmr);
}

// ie浏览器下执行
const tableToIE = (data, name) => {
  let curTbl = data;
  let oXL = new ActiveXObject("Excel.Application");

  //创建AX对象excel
  let oWB = oXL.Workbooks.Add();
  //获取workbook对象
  let xlsheet = oWB.Worksheets(1);
  //激活当前sheet
  let sel = document.body.createTextRange();
  sel.moveToElementText(curTbl);
  //把表格中的内容移到TextRange中
  sel.select;
  //全选TextRange中内容
  sel.execCommand("Copy");
  //复制TextRange中内容
  xlsheet.Paste();
  //粘贴到活动的EXCEL中

  oXL.Visible = true;
  //设置excel可见属性

  try {
    let fname = oXL.Application.GetSaveAsFilename("Excel.xls", "Excel Spreadsheets (*.xls), *.xls");
  } catch (e) {
    print("Nested catch caught " + e);
  } finally {
    oWB.SaveAs(fname);

    oWB.Close(savechanges = false);
    //xls.visible = false;
    oXL.Quit();
    oXL = null;
    // 结束excel进程，退出完成
    window.setInterval("Cleanup();", 1);
    idTmr = window.setInterval("Cleanup();", 1);
  }
}

// 非ie浏览器下执行
const tableToNotIE = (function () {
  // 编码要用utf-8不然默认gbk会出现中文乱码
  const uri = 'data:application/vnd.ms-excel;base64,',
    template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"><head><meta charset="UTF-8"><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--></head><body><table>{table}</table></body></html>';

  const base64 = function (s) {
    return window.btoa(unescape(encodeURIComponent(s)));
  }

  const format = (s, c) => {
    return s.replace(/{(\w+)}/g,
      (m, p) => {
        return c[p];
      })
  }

  return (table, name) => {
    const ctx = {
      worksheet: name,
      table
    }

    const url = uri + base64(format(template, ctx));

    if (navigator.userAgent.indexOf("Firefox") > -1) {
      window.location.href = url
    } else {
      const aLink = document.createElement('a');
      aLink.href = url;
      aLink.download = name || '';
      let event;
      if (window.MouseEvent) {
        event = new MouseEvent('click');
      } else {
        event = document.createEvent('MouseEvents');
        event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
      }
      aLink.dispatchEvent(event);
    }
  }
})()

const resolveOptions = (options) => {
  if (options.length === 1) {
    return options[0]
  }

  return {
    column: options[0] || [],
    data: options[1] || [],
    excelName: options[2] || '',
    captionName: options[3],
  }
}

// 导出函数
const table2excel = (...options) => {
  function getTextHtml(val) {
    return `<td style="text-align: center">${val}</td>`
  }
  function getImageHtml(val, options) {
    options = Object.assign({ width: 40, height: 60 }, options)
    if (Array.isArray(val)) {
      let str = `<td style="width: ${120}px; height: ${120 * val.length}px; text-align: center; vertical-align: middle">`;
      val.forEach((img, index) => {
        str += `<img  src="${img}" width=${120 * .99} height=${120 * .99} /><br/>`;
      })
      str += `</td>`
      console.log(str, 'str')
      return str;
    } else {
      return `<td style="width: ${120}px; height: ${120}px; text-align: center; vertical-align: middle"><img src="${val}" width=${120 * .99} height=${120 * .99} /></td>`
    }
  }
  const typeMap = {
    image: getImageHtml,
    text: getTextHtml,
    format: getTextHtml,
    tag: getTextHtml,
    switch: getTextHtml,
  }
  console.error(typeMap, 'typeMap');
  const {
    column,
    data,
    excelName,
    captionName,
  } = resolveOptions(options)

  let caption = captionName ? `<caption>${captionName}</caption>` : '';

  let thead = column.reduce((result, item) => {
    result += `<td>${item.title}</td>`
    return result
  }, '')

  thead = `<thead><tr>${thead}</tr></thead>`

  let tbody = data.reduce((result, row) => {
    const temp = column.reduce((tds, col) => {
      const options = {}
      if (col.type === 'image') {
        if (row.size) {
          options.width = row.size[0]
          options.height = row.size[1]
        } else {
          col.width && (options.width = col.width)
          col.height && (options.height = col.height)
        }
      }

      tds += typeMap[col.type || 'text'](row[col.key], options)

      return tds
    }, '')

    result += `<tr>${temp}</tr>`

    return result
  }, '')

  tbody = `<tbody>${tbody}</tbody>`

  const table = caption + thead + tbody

  // 导出表格
  exportToExcel(table, excelName)
}

export default table2excel
